When producing steel in the United States, reducing hermatite ore, which is mostly ferric oxide, with coke, often referred to as carbon, in a blast furnace will obtain pig iron. The basic reaction that happens here is Fe2O3(s) + 3C(s)-----> 2Fe(s) + 3CO(g): ΔHr(77°F) = 2.111 *10^5 Btu